/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.explorer.ui.content.email;

import com.vaadin.ui.*;
import com.vaadin.ui.Layout.SpacingHandler;
import com.vaadin.ui.themes.Reindeer;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.TaskService;
import org.activiti.engine.impl.util.json.JSONObject;
import org.activiti.engine.impl.util.json.JSONTokener;
import org.activiti.engine.task.Attachment;
import org.activiti.explorer.Constants;
import org.activiti.explorer.ExplorerApp;
import org.activiti.explorer.I18nManager;
import org.activiti.explorer.Messages;
import org.activiti.explorer.ui.mainlayout.ExplorerLayout;

import java.io.InputStream;
import java.io.InputStreamReader;

/**
 * @author Frederik Heremans
 */
public class EmailDetailPanel extends Panel {

    private static final long serialVersionUID = 1L;

    protected I18nManager i18nManager;
    protected transient TaskService taskService;

    protected Label content;
    protected Attachment attachment;

    protected GridLayout gridLayout;


    public EmailDetailPanel(Attachment attachment) {
        setSizeFull();
        ((AbstractLayout) getContent()).setMargin(true);
        ((SpacingHandler) getContent()).setSpacing(true);
        addStyleName(Reindeer.PANEL_LIGHT);

        this.attachment = attachment;
        this.i18nManager = ExplorerApp.get().getI18nManager();
        this.taskService = ProcessEngines.getDefaultProcessEngine().getTaskService();

        gridLayout = new GridLayout(2, 4);
        gridLayout.setSpacing(true);
        addComponent(gridLayout);

        InputStream contentStream = taskService.getAttachmentContent(attachment.getId());
        // TODO: Error handling
        JSONObject emailJson = new JSONObject(new JSONTokener(new InputStreamReader(contentStream)));

        String html = emailJson.getString(Constants.EMAIL_HTML_CONTENT);
        String subject = emailJson.getString(Constants.EMAIL_SUBJECT);
        String recipients = emailJson.getString(Constants.EMAIL_RECIPIENT);
        String sentDate = emailJson.getString(Constants.EMAIL_SENT_DATE);
        String receivedDate = emailJson.getString(Constants.EMAIL_RECEIVED_DATE);

        // Add subject
        addSimpleRow(Messages.EMAIL_SUBJECT, subject);
        addSimpleRow(Messages.EMAIL_RECIPIENTS, recipients);
        addSimpleRow(Messages.EMAIL_SENT_DATE, sentDate);
        addSimpleRow(Messages.EMAIL_RECEIVED_DATE, receivedDate);

        // Add HTML content
        addHtmlContent(html);

    }

    protected void addHtmlContent(String html) {
        Panel panel = new Panel();
        panel.setWidth(800, UNITS_PIXELS);
        panel.setHeight(300, UNITS_PIXELS);

        content = new Label(html, Label.CONTENT_XHTML);
        content.setHeight(100, UNITS_PERCENTAGE);

        panel.addComponent(content);
        addComponent(panel);
    }

    protected void addSimpleRow(String labelMessageKey, String content) {
        addLabel(labelMessageKey);

        Label subjectLabel = new Label(content);
        subjectLabel.setSizeUndefined();
        subjectLabel.addStyleName(ExplorerLayout.STYLE_LABEL_BOLD);

        gridLayout.addComponent(subjectLabel);
        gridLayout.setComponentAlignment(subjectLabel, Alignment.MIDDLE_LEFT);
    }

    protected void addLabel(String messageKey) {
        Label theLabel = new Label(i18nManager.getMessage(messageKey));
        theLabel.setSizeUndefined();
        gridLayout.addComponent(theLabel);

    }

}
